Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Koivunen, Niko"'
The regime of dark matter (DM) freeze-in at stronger coupling interpolates between freeze-in and freeze-out. It relies on Boltzmann-suppressed dark matter production, implying that the Standard Model bath temperature never exceeds the dark matter mas
Externí odkaz:
http://arxiv.org/abs/2403.15533
Publikováno v:
JCAP 09 (2023) 002
We investigate the formation of large peaks in the inflationary curvature power spectrum from double-well potentials. In such scenarios, the initial CMB spectrum is created at large field values. Subsequently, the inflaton will cross one of the minim
Externí odkaz:
http://arxiv.org/abs/2305.09630
Autor:
Koivunen, Niko, Raidal, Martti
The CMS experiment at CERN has reported a possible signal for a resonance at 146 GeV decaying into the $e\mu$ final state which, presently, is the only experimental hint for lepton flavour violation in any low- and high-energy experiment. The Froggat
Externí odkaz:
http://arxiv.org/abs/2305.00014
We construct an analytically solvable simplified model that captures the essential features for primordial black hole (PBH) production in most models of single-field inflation. The construction makes use of the Wands duality between the constant-roll
Externí odkaz:
http://arxiv.org/abs/2205.13540
Autor:
Kannike, Kristjan, Koivunen, Niko, Kubarski, Aleksei, Marzola, Luca, Raidal, Martti, Strumia, Alessandro, Vipp, Venno
We consider the classically scale invariant Higgs-dilaton model of dynamical symmetry breaking extended with an extra scalar field that plays the role of dark matter. The Higgs boson is light near a critical boundary between different symmetry breaki
Externí odkaz:
http://arxiv.org/abs/2204.01744
Tachyonic preheating is realized when the inflaton repeatedly returns to a convex region of the potential during the post-inflationary oscillating phase. This will induce a strong tachyonic instability and lead to a rapid fragmentation of the coheren
Externí odkaz:
http://arxiv.org/abs/2201.04145
Autor:
Huitu, Katri, Kannike, Kristjan, Koivunen, Niko, Marzola, Luca, Mondal, Subhadeep, Raidal, Martti
The recently proposed multi-phase criticality principle in Coleman-Weinberg models can provide a new explanation for the hierarchy between the electroweak and new physics scales. When applied to the Standard Model, a Higgs boson as light as the pseud
Externí odkaz:
http://arxiv.org/abs/2201.00824
Autor:
Criado, Juan Carlos, Djouadi, Abdelhak, Koivunen, Niko, Müürsepp, Kristjan, Raidal, Martti, Veermäe, Hardi
We present an effective field theory of the $\Delta$-resonance as an interacting Weinberg's $(3/2,0)\oplus (0,3/2)$ field in the multi-spinor formalism. We derive its interactions with nucleons $N$, pions $\pi$ and photons $\gamma$, and compute the $
Externí odkaz:
http://arxiv.org/abs/2106.09031
Autor:
Criado, Juan C., Djouadi, Abdelhak, Koivunen, Niko, Müürsepp, Kristjan, Raidal, Martti, Veermäe, Hardi
The new measurement of the muon's anomalous magnetic moment released by the Muon g-2 experiment at Fermilab sets strong constraints on the properties of many new particles. Using an effective field theory approach to the interactions of higher-spin f
Externí odkaz:
http://arxiv.org/abs/2104.03231
Using an effective field theory approach for higher-spin fields, we derive the interactions of colour singlet and electrically neutral particles with a spin higher than unity, concentrating on the spin-3/2, spin-2, spin-5/2 and spin-3 cases. We compu
Externí odkaz:
http://arxiv.org/abs/2102.13652